제출 #636337

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
636337		as111	Traffic (IOI10_traffic)	C++14	0 / 100	25 ms	47188 KiB

traffic

#include <traffic.h>
#include <vector>
#define MAXN 1000000
using namespace std;
int pop[MAXN];
vector<int> vals[MAXN];// amt congestion for each path coming out
vector<int> adj[MAXN];
int total = 0; // total people everywhere
int ans = 2000001;
int dfs(int x, int y) {//y is back edge
	int amt = pop[x];
	for (int e : adj[x]) {
		if (e == y) continue;
		int edge = dfs(e, x);
		vals[x].push_back(edge);
		amt += edge;
	}

	return amt;
}
int LocateCentre(int N, int P[], int S[], int D[]) {
	for (int i = 0; i < N - 1; i++) {
		total += P[i];
		pop[i] = P[i];
		adj[S[i]].push_back(D[i]);
		adj[D[i]].push_back(S[i]);
	}
	total += P[N - 1];
	pop[N-1] = P[N - 1];
	dfs(0, -1);
	int ansi = 0;
	for (int i = 0; i < N; i++) {
		int mx = 0;
		int amt = 0;
		for (int val : vals[i]) {
			mx = max(mx, val);
			amt += val;
		}
		mx = max(mx, total - amt - pop[i]);
		if (mx < ans) {
			ans = mx;
			ansi = i;
		}
	}
	return ansi;
}

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